Réponses

2013-04-02T18:17:10+02:00

c est toujours le même principe

 

2/3 x 33=22

2/8 x 720=180

3/4 x 160=120

1/10 x 100=10

2013-04-02T18:18:20+02:00

2/3*33 = (2*33)/3 = (2*3*11)/3 = 2*11 = 22

 

2/8*720 = (2*720)/8 = (2*8*90)/8 = 2*90 = 180

 

3/4*160 = (3*160)/4 = (3*4*40)/4 = 3*40 = 120

 

1/10*100 = (1*100)/10 = (1*10*10)/10 = 1*10 = 10